SaveAllInBackground根据需要在deleteAllInBackground中不起作用.
我正在尝试使用后台全部保存来保存一个parSEObjects列表.为了避免表中的重复,我正在查询已存在的行并删除它们(如果有)然后保存新副本.因此我在deleteAllInBackground的回调中调用saveAllInBackground.
问题是这样的：
例如：如果要删除的列表包含[a,b,c,d],并且要上传的列表包含[a,d,e,f],则只有[e,f]才能进行解析.我将[a,f]传递给saveAllInBackground但只保留了[e,f].
>有什么我想念的吗？怎么解决这个？
>我可以使用不同的方法吗？
>有没有更好的方法来避免重复？我不想添加一个
beforeSave hook.调用saveAll的全部目的是减少API调用的数量.我想如果我使用beforeSave,我将不得不在云代码中运行一些查询.
这是我的代码
ParseQuery query = new ParseQuery("PostChoice");
query.fromPin();
query.findInBackground(new FindCallback<ParSEObject>() {
@Override
public void done(final List<ParSEObject> localList,ParseException e) {
if (localList != null && !localList.isEmpty()) {
List<ParSEObject> postList = new ArrayList<ParSEObject>();
for (ParSEObject object : localList) {
postList.add(object.getParSEObject("post"));
}
ParseQuery query = new ParseQuery("PostChoice");
query.whereContainedIn("post",postList);
query.whereEqualTo("user",ParseUser.getCurrentUser());
query.findInBackground(new FindCallback<ParSEObject>() {
@Override
public void done(List<ParSEObject> parseCloudList,ParseException e) {
if (parseCloudList != null && !parseCloudList.isEmpty()) {
ParSEObject.deleteAllInBackground(parseCloudList,new DeleteCallback() {
@Override
public void done(ParseException e) {
// this gets executed and rows are accordingly deleted
ParSEObject.saveAllInBackground(localList,new SaveCallback() {
@Override
public void done(ParseException e) {
// this gets executed but the rows are not uploaded.
//the locallist is not empty. it contains the right data.
editor.putLong(Four.LAST_CHOICE_SYNC_TIME,System.currentTimeMillis());
editor.commit();
Log.i("SyncChoiceService","Synced Choices");
}
});
}
});
}
else{
ParSEObject.saveAllInBackground(localList,new SaveCallback() {
@Override
public void done(ParseException e) {
Log.i("SyncChoiceService","Synced Choices");
editor.putLong(Four.LAST_CHOICE_SYNC_TIME,System.currentTimeMillis());
editor.commit();
}
});
}
}
});
}
}
});
解决方法
我想出了这样的解决方案.它符合我的要求.我使用updatedValue并删除旧的,其余的更新作为整个列表.
ParseQuery query = new ParseQuery("PostChoice");
query.fromPin();
query.findInBackground(new FindCallback<ParSEObject>() {
@Override
public void done(final List<ParSEObject> localList,ParseException e) {
if (localList != null && !localList.isEmpty()) {
List<ParSEObject> postList = new ArrayList<ParSEObject>();
for (ParSEObject object : localList) {
postList.add(object.getParSEObject("post"));
}
ParseQuery query = new ParseQuery("PostChoice");
query.whereContainedIn("post",postList);
query.whereLessThan("updatedAt",System.currentTimeMillis());
query.whereEqualTo("user",ParseUser.getCurrentUser());
query.findInBackground(new FindCallback<ParSEObject>() {
@Override
public void done(final List<ParSEObject> parseCloudList,ParseException e) {
if (parseCloudList != null && !parseCloudList.isEmpty()) {
ParSEObject.deleteAllInBackground(parseCloudList,new DeleteCallback() {
@Override
public void done(ParseException e) {
Log.i("SyncChoiceService","Deleted old Choices");
}
});
}
}
});
ParSEObject.saveAllInBackground(localList,new SaveCallback() {
@Override
public void done(ParseException e) {
Log.i("SyncChoiceService","Synced Choices");
}
});
}
}
});
